Cloning this repository:

git clone git://gitorious.org/~luisgabriel/qml-box2d/luisgabriel-qml-box2d.git luisgabriel-qml-box2d
cd luisgabriel-qml-box2d

Add this repository as a remote to an existing local repository:

git remote add luisgabriel-qml-box2d git://gitorious.org/~luisgabriel/qml-box2d/luisgabriel-qml-box2d.git
git fetch luisgabriel-qml-box2d
git checkout -b my-local-tracking-branch luisgabriel-qml-box2d/master_or_other_branch